vendor/rustix/src/imp/libc/io/windows_syscalls.rs

   1 //! Windows system calls in the `io` module.
   2
   3 use super::super::c;
   4 use super::super::conv::{borrowed_fd, ret, ret_c_int};
   5 use super::super::fd::LibcFd;
   6 use crate::fd::{BorrowedFd, RawFd};
   7 use crate::io;
   8 use crate::io::PollFd;
   9 use core::convert::TryInto;
  10 use core::mem::MaybeUninit;
  11
  12 pub(crate) unsafe fn close(raw_fd: RawFd) {
  13     let _ = c::close(raw_fd as LibcFd);
  14 }
  15
  16 pub(crate) fn ioctl_fionread(fd: BorrowedFd<'_>) -> io::Result<u64> {
  17     let mut nread = MaybeUninit::<c::c_ulong>::uninit();
  18     unsafe {
  19         ret(c::ioctl(borrowed_fd(fd), c::FIONREAD, nread.as_mut_ptr()))?;
  20         Ok(u64::from(nread.assume_init()))
  21     }
  22 }
  23
  24 pub(crate) fn ioctl_fionbio(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
  25     unsafe {
  26         let mut data = value as c::c_uint;
  27         ret(c::ioctl(borrowed_fd(fd), c::FIONBIO, &mut data))
  28     }
  29 }
  30
  31 pub(crate) fn poll(fds: &mut [PollFd<'_>], timeout: c::c_int) -> io::Result<usize> {
  32     let nfds = fds
  33         .len()
  34         .try_into()
  35         .map_err(|_convert_err| io::Errno::INVAL)?;
  36
  37     ret_c_int(unsafe { c::poll(fds.as_mut_ptr().cast(), nfds, timeout) })
  38         .map(|nready| nready as usize)
  39 }